Volcanic ash can melt if it's sucked into aircraft engines.

如果被飞机引擎吸入，火山灰会融化。

Aircraft engines are optimised for level flight at cruising speed in the stratosphere.

飞机引擎被调校以适应在平流层以巡航速度水平飞行。

Contrails are made up of ice crystals that form when aircraft engines emit exhaust that hits the cold air.

凝结尾由冰晶组成，而冰晶则由飞机引擎排放的废气遇冷空气凝结而成。

He started to warm up the aircraft’s engines.

【warm】他开始预热飞机引擎。

As Cox observes, one big consideration is  the preservation of an aircraft's engines.

正如考克斯所观察到的，一个重要的考虑因素是飞机发动机的保护。

So has Walmart, America's mightiest supermarket chain, and Rolls-Royce, a British maker of aircraft engines.

美国最大的连锁超市沃尔玛和英国飞机发动机制造商劳斯莱斯也是如此。

Founded in 1916, BMW, or Bayerische Motoren Werke AG, started as a manufacturer of aircraft engines.

BMW 或 Bayerische Motoren Werke AG 成立于 1916 年，最初是一家飞机发动机制造商。

The aim of this technology is to reduce  the noise made by the aircraft's engines.

这项技术的目的是降低飞机发动机产生的噪音。

Airbus's share price plunged by 10%, after it slashed its profit forecast because of supply-chain problems that have left it with a shortage of aircraft engines.

空客公司股价暴跌10%，此前该公司因供应链问题大幅下调利润预期，供应链问题导致其飞机发动机短缺。

However, the Treaty of Versailles at the end of World War I prohibited the German company from producing aircraft engines, pushing BMW to reinvent itself.

然而，第一次世界大战结束时的凡尔赛条约禁止这家德国公司生产飞机发动机，促使宝马重塑自我。